Is the Bosch 70096 a full cooktop or a single burner?

It is a single electric hotplate, one burner on a freestanding base. It is meant as a supplement or a portable cooking surface, not a replacement for a full range.

Can I use it in an RV or dorm?

Yes, it is a common choice for RVs, dorms and small apartments because it needs only a standard outlet and takes little counter space. Check your outlet and power draw before use.

Does it have more than one heat setting?

It uses a dial to vary heat rather than a single on-off switch, so you can adjust from a low simmer to a boil. Exact settings vary by unit.

How does it compare with a two-burner portable cooktop?

A two-burner unit lets you cook two pots at once but takes roughly twice the counter and storage space. The 70096 is smaller and simpler, better for one-pan meals and tight kitchens.